Figure 5
From: New fossil assemblages from the Early Ordovician Fezouata Biota
Sedimentary context of Taichoute. (a) Overview of the upper part of the Fezouata Shale displaying a transition between a1, a2, and a3. The large siltstone-lobes of a3 transition upward into the overlying Middle Ordovician Tachilla Formation. The white arrows show the lateral discontinuity, characteristic of the siltstone lobes. (b) The asymmetrical cross-laminations form current ripples displayed in the siltstone lobes. (c) Reactivation surfaces occur frequently in the siltstone lobes, attesting to the turbulence of repeated density flows. These deposits also display planar laminations.
